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Finding the Fourth Proportional to 1,389,667.97, 1,918,938.65 and 874,280.92

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Solution

The fourth proportional to 1,389,667.97, 1,918,938.65 and 874,280.92 is: 1,207,260.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,667.97 : 1,918,938.65 = 874,280.92 : x
  2. Step 2: Convert to fraction form
    1,389,667.97/1,918,938.65 = 874,280.92/x
  3. Step 3: Cross multiply
    1,389,667.97x = 1,918,938.65 × 874,280.92
  4. Step 4: Simplify right side
    1,389,667.97x = 1,677,691,438,750.86
  5. Step 5: Solve for x
    x = 1,677,691,438,750.86/1,389,667.97
  6. Step 6: Final answer
    x = 1,207,260.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.